From df13b8ffd199223881daf9231cdd63ec6f6b716f Mon Sep 17 00:00:00 2001
From: Cyrus Najmabadi <cyrusn@microsoft.com>
Date: Thu, 18 Jun 2015 11:43:16 -0700
Subject: [PATCH] Update comment.

---
 src/compiler/checker.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 3fd917bc00e..0fcc478d2b1 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -11684,6 +11684,9 @@ namespace ts {
         var cancellationToken: CancellationTokenObject;
         function getDiagnostics(sourceFile: SourceFile, ct: CancellationTokenObject): Diagnostic[] {
             try {
+                // Record the cancellation token so it can be checked later on during checkSourceElement.
+                // Do this in a finally block so we can ensure that it gets reset back to nothing after
+                // this call is done.
                 cancellationToken = ct;
                 return getDiagnosticsWorker(sourceFile);
             }